Finding the Fourth Proportional to 21,420.02, 32,120.71 and 10,178.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,420.02 : 32,120.71 = 10,178.62 : x
2. Step 2: Convert to fraction form
   21,420.02/32,120.71 = 10,178.62/x
3. Step 3: Cross multiply
   21,420.02x = 32,120.71 × 10,178.62
4. Step 4: Simplify right side
   21,420.02x = 326,944,501.22
5. Step 5: Solve for x
   x = 326,944,501.22/21,420.02
6. Step 6: Final answer
   x = 15,263.50